Northern California fire officials say a man dependent on oxygen died about 12 minutes after Pacific Gas and Electric shut down power to the area as part of a massive effort to prevent fire. El Dorado County Fire Chief Lloyd Ogan said Friday that fire personnel responded to a call in Pollock Pines that came in after 3:30 a.m. Wednesday. He said crews arrived to find an unresponsive man in his 60s and were unable to revive him. Ogan said the man’s oxygen equipment required power but could not say whether the shutdown was related to his death. PG&E spokesman Jeff Smith said it has not been able to confirm the accuracy of the report. The utility started turning off electricity early Wednesday in Northern and Central California in advance of strong, dry winds.